Re: need clarification about this error and what to do
from Unisphere confirm that the IP address of the management LAN is configured correctly.... Make sure that the management LAN IP on SPB is pingabble.
Check the network connectivity, cables and the switch port if the SP is working fine. Otherwise check the SP if there is any amber LED on it.
If everything is fine, seems to be a problem in the management Server Process (CIMOM) and you can verify this from the SP events. if so, login to https://SPB_IP_ADDRESS/setup as sysadmin and click on Restart Management Server button.